单项选择题

Which of the following words best describes Mum（）

A．Polite.
B．Patient.
C．Changeable.
D．Clever.

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单项选择题
If the condor population has tripled since two decades ago, about how many are there now（）

A．90.
B．60.
C．33.
D．300.
填空题
A．procession B．professor C．mission D．pressure
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